package cn.util;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;

import cn.springmvc.model.Student;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;


public class ExcelImportAndExpert {
	/**
	 * @功能：手工构建一个简单格式的Excel
	 */
	private static void getStudent() throws Exception {
		List list = new ArrayList();
		SimpleDateFormat df = new SimpleDateFormat("yyyy-mm-dd");

		Student user1 = new Student(1, "张三", 16, df.parse("1997-03-12"));
		Student user2 = new Student(2, "李四", 17, df.parse("1996-08-12"));
		Student user3 = new Student(3, "王五", 26, df.parse("1985-11-12"));
		list.add(user1);
		list.add(user2);
		list.add(user3);
		// 第一步，创建一个webbook，对应一个Excel文件
		HSSFWorkbook wb = new HSSFWorkbook();
		// 第二步，在webbook中添加一个sheet,对应Excel文件中的sheet
		HSSFSheet sheet = wb.createSheet("学生表一");
		// 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制short
		HSSFRow row = sheet.createRow((int) 0);
		// 第四步，创建单元格，并设置值表头 设置表头居中
		HSSFCellStyle style = wb.createCellStyle();
		style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式

		HSSFCell cell = row.createCell((short) 0);
		cell.setCellValue("学号");
		cell.setCellStyle(style);
		cell = row.createCell((short) 1);
		cell.setCellValue("姓名");
		cell.setCellStyle(style);
		cell = row.createCell((short) 2);
		cell.setCellValue("年龄");
		cell.setCellStyle(style);
		cell = row.createCell((short) 3);
		cell.setCellValue("生日");
		cell.setCellStyle(style);

		// 第五步，写入实体数据 实际应用中这些数据从数据库得到，
		// List list = ExcelImportAndExpert.getStudent();

		for (int i = 0; i < list.size(); i++) {
			row = sheet.createRow((int) i + 1);
			Student stu = (Student) list.get(i);
			// 第四步，创建单元格，并设置值
			row.createCell((short) 0).setCellValue((double) stu.getId());
			row.createCell((short) 1).setCellValue(stu.getName());
			row.createCell((short) 2).setCellValue((double) stu.getAge());
			cell = row.createCell((short) 3);
			cell.setCellValue(new SimpleDateFormat("yyyy-mm-dd").format(stu
					.getBirth()));
		}
		// 第六步，将文件存到指定位置
		try {
			FileOutputStream fout = new FileOutputStream("E:/students.xlsx");
			wb.write(fout);
			fout.close();
		} catch (Exception e) {
			e.printStackTrace();
		}

		// return list;
	}

	public static List<Student> readXls(String path) throws IOException {
		InputStream is = new FileInputStream(path);
		HSSFWorkbook hssfWorkbook = new HSSFWorkbook(is);
		Student student = null;
		List<Student> list = new ArrayList<Student>();
		// 循环工作表Sheet
		for (int numSheet = 0; numSheet < hssfWorkbook.getNumberOfSheets(); numSheet++) {
			HSSFSheet hssfSheet = hssfWorkbook.getSheetAt(numSheet);
			if (hssfSheet == null) {
				continue;
			}
			// 循环行Row
			for (int rowNum = 1; rowNum <= hssfSheet.getLastRowNum(); rowNum++) {
				HSSFRow hssfRow = hssfSheet.getRow(rowNum);
				if (hssfRow != null) {
					student = new Student();
					HSSFCell no = hssfRow.getCell(0);
					HSSFCell name = hssfRow.getCell(1);
					HSSFCell age = hssfRow.getCell(2);
					HSSFCell bir = hssfRow.getCell(3);
					student.setId(Integer.valueOf(no.toString().replaceAll(
							".0", "")));
					student.setName(name.toString());
					student.setAge(Integer.valueOf(age.toString().replaceAll(
							".0", "")));
					System.out.println(bir.toString());
					SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");// 小写的mm表示的是分钟
					String dstr = bir.toString();
					try {
						java.util.Date date = sdf.parse(dstr);
						student.setBirth(date);
					} catch (ParseException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}

					list.add(student);
				}
			}
		}
		return list;
	}

	public static void main(String[] args) throws Exception {
//		 getStudent();
//		List<Student> listss = readXls("E:/students.xlsx");
//		for (Student s : listss) {
//			System.out.println(s.getId());
//			System.out.println(s.getName());
//			System.out.println(s.getBirth());
//			System.out.println(s.getAge());
//		}
	}

}
